Recent questions tagged C++

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c++ - Should we generally use float literals for floats instead of the simpler double literals?

In C++ (or maybe only our compilers VC8 and VC10) 3.14 is a double literal and 3.14f is a float literal. ... hard to maintain! -- float suffix?) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Header file included only once in entire program?

I know this is a common question but I still can't fully get my head around it. In a C or C++ ... in the code it was previously included ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Specify template parameters at runtime

Consider the following template class class MyClassInterface { public: virtual double foo(double) = 0; } ... using more template parameters. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to make elements of vector unique? (remove non adjacent duplicates)

I have a vector containing few non-adjacent duplicates. As a simple example, consider: 2 1 6 1 4 6 2 1 ... the vector ? what is its complexity? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Performance of dynamic_cast?

Before reading the question: This question is not about how useful it is to use dynamic_cast. Its just about its ... slow if it isn't? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What happens if I read a map's value where the key does not exist?

map<string, string> dada; dada["dummy"] = "papy"; cout << dada["pootoo"]; I'm puzzled because I don't ... exist, do I just use find instead ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Can the "Application Error" dialog box be disabled?

I am using Hudson as a continuous integration server to test C/C++ code. Unfortunatly, I have a bug ... instead of showing the dialog? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Handling partial return from recv() TCP in C

I've been reading through Beej's Guide to Network Programming to get a handle on TCP connections. In one of ... Stream Server in the guide. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Doing a static_assert that a template type is another template

How do I static_assert like this? Maybe Boost supports it if not C++ or new features in C++11? template<T> struct ... T,"failure"); //how? }; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - When to use new and delete

I am re-reading some code from a while ago on C++ (I am learning Java in school right now), and I am a ... ) delete f2; // initialize again... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Assignment operator inheritance

There is this code: #include <iostream> class Base { public: Base(){ std::cout << "Constructor base" ... assignment operator is not inherited? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to generate all permutations of an array in sorted order?

I have an array, and the user can insert a string. And I have this code: int main(){ char ... -calculadora.html without repetition and sorted See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Passing rvalues through std::bind

I want to pass an rvalue through std::bind to a function that takes an rvalue reference in C++0x. I can't ... same effect as foo(Movable()) } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - CMake is not finding Boost

I am trying to install CGAL. They describe their installation process as ever-so-simple here, section 6.1. When ... to repeat the question...) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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846 views

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c++ - How to append text to QPlainTextEdit without adding newline, and keep scroll at the bottom?

I need to append text to QPlainTextEdit without adding a newline to the text, but both methods ... /gui/widgets/qplaintextedit.cpp#n2763 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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254 views

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c++ - debugging information cannot be found or does not match visual studio's

I copied an existing project and renamed the folder. Now I get this error when I try to compile the application ... to get it to stop. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to use Macro argument as string literal?

I am trying to figure out how to write a macro that will pass both a string literal representation of a ... into a string literal itself. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Multiple definition of inline functions when linking static libs

I have a C++ program that I compile with mingw (gcc for Windows). Using the TDM release of ... of Inline functions with different definitions See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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664 views

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c++ - Simulating key press events in Mac OS X

I'm writing an app where I need to simulate key press events on a Mac, given a code that represents each key. ... been able to find. Any ideas? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Problem with std::map::iterator after calling erase()

// erasing from map #include <iostream> #include <map> using namespace std; int main () { map<char,int> ... .com/reference/stl/map/erase/ See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - how to test a string for letters only

how could I test a string against only valid characters like letters a-z?... string name; cout << "Enter your ... found = letters.find(it); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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371 views

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c++ - dynamically allocated memory after program termination

When a C/C++ program containing the dynamically allocated memory(using malloc/new) without free/delete calls ... unaccessible to other programs? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - expand file names that have environment variables in their path

What's the best way to expand ${MyPath}/filename.txt to /home/user/filename.txt or %MyPath%/filename.txt ... for general purpose path expansion. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Linking Libraries in Xcode

I'm using a powerbook (osx 10.5) and recently downloaded and installed FFTW 3.2 (link text). I've been ... see: link text thanks for any help See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Empirically determine value category of C++11 expression?

Each expression in C++11 has a value category. One of lvalue, xvalue or prvalue. Is there a way to ... } How could VALUE_CAT be implemented? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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238 views

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c++ - How to use sfinae for selecting constructors?

In template meta programming, one can use SFINAE on the return type to choose a certain template member function, ... I can use SFINAE instead. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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470 views

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c++ - accessing a protected member of a base class in another subclass

Why does this compile: class FooBase { protected: void fooBase(void); }; class Foo : public FooBase { public: ... not the second code snippet. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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299 views

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c++ - Error: Could not resolve SDK path for 'macosx10.8'

So I just installed qt around 5 minutes ago, and when I wanted to code a simple line of text in the Push Button ... I hope you know what i mean) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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